I normally spend as few words as possible on graphics, so when you get more than a short paragraph, you know something is either really right or really wrong. Half-Blood Prince combines semi-cel-shaded characters with pre-rendered, static backgrounds. The game looks okay, though this is a case where style would have won out over realism. I get that the artists were trying to convey the story's darker theme with dark graphics. What I don't get is why everything looks so bland and boring. The DS is never going to reproduce "real," so why not use some creative license?
Backgrounds are composed of flat greys and browns, as are the characters. Half-Blood Prince manages to capture the scope and scale of Hogwarts, though elements like the shifting staircase make it feel like any other castle. Still, the attempt to squeeze every nook and cranny of Hogwarts into a handheld game is an ambitious one, so I credit the developers for trying. At the same time, I wonder how necessary endeavor was in the first place, especially when it hurts gameplay. Just because you can make a big castle doesn't mean you have to.
Outside the familiar Harry Potter theme, I'm pretty sure none of the in-game music comes from the movies. Or, at least they didn't sound like anything I'd heard before. The soundtrack is okay, though the droning background music doesn't make the sluggish gameplay go any faster.